LVDT Signal Conditioner DIN Rail Mounted S1A Series

Specifically Designed and Engineered for Applications in Power Generating Steam Turbine Control Systems

World's Most Advanced AC-LVDT Signal Conditioner

The LVDT Signal Conditioner S1A DIN rail module from the Alliance Sensors Group ends the usual difficulties that accompany AC-LVDT set up with a built-in null indicator and simple front panel pushbuttons to set zero and full scale. Engineered to work with the widest range of AC-LVDTs and inductive half-bridges, the S1A module monitors LVDT operation and indicates most common failures. The S1A offers a choice of four excitation frequencies and eight analog DC outputs, as well as an RS-485 digital communications port. These features make the Alliance Sensors Group S1A the world's most advanced LVDT signal conditioner.

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Applications:

Turbine Controls Systems using LVDT Position Sensors
Steam Valve Position Feedback using LVDT Position Sensors
Redundant Control Systems using LVDT Position Sensors
Feed water boiler pumps, Stop Valves, Throttle Valves and Conditioning Valve Position Sensor Feedback

Features

Smart setup with 2 front panel push buttons --- NO POTS
Built-in null indicator: LEDs and separate DC null voltage output
Choice of 1, 3, 5, or 10 kHz nominal excitation frequencies
Use with 3-, 4-, 5-, or 6-wire LVDTs and inductive half-bridges including 3-wire GE LVRTs
Choice of 6 DC voltage outputs and 2 current loop outputs
40 dB range of FS outputs from LVDT: 50 mV rms to 5 Volts rms
Fail-safe master/slave syncing eliminates beat frequencies

15 - 30 Volts DC operation, 80 mA maximum operating current
Self-diagnostic for LVDT winding failures or cable disconnection
Independent failure warning flag via open collector output
Digital communications link via RS-485 multi-drop bus with up to 16 individual module addresses
Hot swappable: set-up can be saved/reloaded via RS-485 port
Color coded plug-in connections to 22.5 mm wide DIN-rail module
TWO (2) YEAR warranty instead of industry standard (1) year

S1A Data Sheet

S1A Operating Manual

Specifications

Operating power:	+15 to +30 V DC (+24 V DC nominal), 60 mA max. at 24 V DC; +15 V DC and -15 V DC for -10 V to +10 V DC bipolar output
Excitation voltage:	3.0 Vrms sine wave push-pull drive nominal (factory default) 4.5 Vrms sine wave push-pull drive via on-board jumper shift 1.5 Vrms single ended drive for low impedance (100 -150 O) primary
Excitation frequencies:	1 kHz, 3 kHz, 5 kHz, 10 kHz (nominal)
Master/slave syncing:	Master output couples up to fifteen slave inputs; if original master fails, new master is automatically generated for fail-safe excitation control.
LVDT AC Output Signal:	50 mVrms to 5000 mVrms at LVDT's full scale position
Analog DC Outputs:	0 - 5 V, 1 - 5 V, 0.5 - 4.5 V, 0 -10 V, -10 to +10 V, 0.5 - 9.5 V, 0 -20 mA sourcing, 4 -20 mA sourcing
Loop resistance:	850 Ω max (current loop output mode, 24 V DC supply)
Output non-linearity:	≤0.025% of Full Span Output (FSO)
Frequency response:	-3 dB at 10% of excitation frequency (minimum) (standard: DS2-4 off) -3 dB at 10 Hz (nominal) (low noise setting: DS2-4 on)
Noise and ripple:	≤2 mVrms (voltage output), or ≤4 µArms (current loop output.)
Fault indication:	Loss of excitation, open primary or secondary, LVDT disconnected
Fault output:	LED indicators, open collector output, 50 mA, 26.5 V DC max.
Null detection:	Front panel LEDs, ± 30 mV threshold out of ˜ ±1.6V signal level
Null output:	LEDs, DC null voltage signal (˜ ±3 V DC = ±FS)
Operating Temperature:	-20 °C to +75 °C
Temperature coefficient:	-0.002% of FSO / °C (combined zero and span shift)
Zero set:	Front panel push button or RS-485 command
Full Scale set:	Front panel push button or RS-485 command
Digital interface:	RS-485 2-wire multi-drop network, 16 addresses

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LVDT Signal Conditioner DIN Rail Mounted S1A Series

Specifically Designed and Engineered for Applications in Power Generating Steam Turbine Control Systems